This is Rebekah Pendley. She's a 19-year-old sophomore at the University of Texas, San Antonio.

Rebekah Pendley

Last week, Pendley saw a man she thought was the boyfriend of Jasmine Rios — a woman she follows on Twitter— with another chick in the university's library.

Jasmine Rios

Here's Rios, 18, with her 21-year-old boyfriend Isiah Williamson.

Jasmine Rios

Despite only knowing Rios through Twitter, Pendley DM'd her with some warning and photographic evidence. Before doing so, Pendley said, she first consulted with a group text to make sure that reaching out was the right decision. "It’s just the right thing to do," she added, of her choice to contact her fellow student.

So, how do the twins Isiah and Aaron Williamson feel about what happened? Isiah — pictured on the right in the below photo — said people on campus mix them up all the time, but not like this. He called Pendley's DM "funny" and "unexpected." Aaron said that he and his girlfriend burst out laughing in the library after Rios texted them about what went down.

Jasmine Rios

While some people weren't as impressed with the gesture from Pendley...